EP2245776A1 - Pfadberechnungs-elementprotokollsoperation zur unterstützung wellenlängengeschalteter, optischer netzwerkleitweglenkung, wellenlängenzuweisung und wertminderungsvalidierung - Google Patents

Pfadberechnungs-elementprotokollsoperation zur unterstützung wellenlängengeschalteter, optischer netzwerkleitweglenkung, wellenlängenzuweisung und wertminderungsvalidierung

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Publication number
EP2245776A1
EP2245776A1 EP10745833A EP10745833A EP2245776A1 EP 2245776 A1 EP2245776 A1 EP 2245776A1 EP 10745833 A EP10745833 A EP 10745833A EP 10745833 A EP10745833 A EP 10745833A EP 2245776 A1 EP2245776 A1 EP 2245776A1
Authority
EP
European Patent Office
Prior art keywords
path
pce
rwa
wavelength
impairment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10745833A
Other languages
English (en)
French (fr)
Other versions
EP2245776A4 (de
EP2245776B1 (de
Inventor
Lee Young
Bemstein Greg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of EP2245776A1 publication Critical patent/EP2245776A1/de
Publication of EP2245776A4 publication Critical patent/EP2245776A4/de
Application granted granted Critical
Publication of EP2245776B1 publication Critical patent/EP2245776B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0256—Optical medium access at the optical channel layer
    • H04J14/0257—Wavelength assignment algorithms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0267—Optical signaling or routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0267—Optical signaling or routing
    • H04J14/0271—Impairment aware routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/42—Centralised routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/44—Distributed routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/62—Wavelength based
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0256—Optical medium access at the optical channel layer
    • H04J14/0258—Wavelength identification or labelling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0267—Optical signaling or routing
    • H04J14/0269—Optical signaling or routing using tables for routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0073—Provisions for forwarding or routing, e.g. lookup tables
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0086—Network resource allocation, dimensioning or optimisation

Definitions

  • RWA routing and wavelength assignment
  • FIG. 10 is a protocol diagram of another embodiment of a path computation communication method.
  • FIG. 12 is a schematic diagram of an embodiment of a general-purpose computer system.
  • the impairment validation process may be separated from the RWA process to deal with impairment sharing constraints. For example, one PCE may compute impairment candidates and another PCE uses this information while performing RWA.
  • the requirements for PCE-to-PCE interaction with the separated IA-RWA architecture are addressed herein.
  • distributed IA-RWA a standard path computation (unaware of detailed wavelength availability or optical impairments) takes place. Then, wavelength assignment and impairment validation is performed along this path in a distributed manner via signaling (RSVP-TE).
  • RSVP-TE signaling
  • PCEP requirements for the distributed IA-RWA architecture may be covered by existing or emerging GMPLS PCEP extensions and does not present new WSON specific requirements.
  • an RWA-PCC to PCE interface may perform several operations including a new RWA path request/reply, an RWA path re-optimization request/reply, and a combined primary and backup RWA request.
  • the Path Computation Request (PCReq) Message includes the path computation type (e.g., RWA or only routing). This requirement is needed to differentiate between routing with the distribute wavelength assignment option and combined RWA. Further, the PCReq Message may include optical signal quality parameters to which all feasible paths should conform.
  • the PCE 130 may receive a path computation request from a PCC.
  • the PCC may be any client application requesting a path computation to be performed by the PCE 130.
  • the PCC may also be any network component that makes such a request, such as the control plane controller 120, or any NE 112, such as a ROADM or a FOADM.
  • the PCC communicates with the PCE 130 using PCEP, although other acceptable communications protocol may be used as well.
  • the IA-RWA process may comprise detailed IV (IV-Detailed), where a validation request for a path and an associated wavelength may be submitted. The path and the associated wavelength may then be validated and accordingly a response may be provided. Similar to the case of IV for candidate paths, the IV response may not disclose impairment information about the vendor's equipment.
  • the IA-RWA process may comprise distributed IV, where approximated impairment degradation measures may be used, such as OSNR, differential group delay (DGD), etc. The approximated measures may be carried through and accumulated along a path, e.g. using GMPLS or other signaling protocol. When the accumulated measures reach a destination node, a final decision may be made about the path validity. This approach may require disclosing impairment information about a vendor's equipment, e.g. along the path.
  • a PCC 210 may send a path computation request, which may comprise path computation information, to a PCE 220.
  • the path computation request may comprise RWA information and the PCE 220 may have previous knowledge of shared impairment information, e.g. for a plurality of vendors' equipment. However, the PCE 220 may request additional impairment information, such as non-shared impairment information for any additional vendor's equipment.
  • the PCE 220 may then perform combined routing, WA, and IV using the RWA information and the impairment information.
  • the PCE 220 may use a single computation entity, such as a processor, to perform the combined IA-RWA.
  • path selection and wavelength assignment are based at least in part on new PCEP requirements such as the new RWA path requests, the RWA path re- optimization requests and/or the combined primary and backup RWA requests described herein.
  • a PCC 310 may send a path computation request to a first PCE 320.
  • the first PCE 320 may be configured to perform routing, WA, and IV for candidate paths (IV-Candidates).
  • the first PCE 320 may use the RWA information in the path computation request to perform a combined IA-RWA.
  • the second PCE 322 may have previous knowledge of impairment information that may not be shared with the first PCE 320 and may use the impairment information to validate the paths. Additionally, the second PCE 322 may request additional impairment information, such as non-shared impairment information for any additional vendor's equipment. Thus, the second PCE 322 may validate each computed path and return a final list of validated paths to the first PCE 320, which may then forward the list to the PCC 310. The final list of validated paths may not comprise the private impairment information.
  • the combined IA-RWA architecture 300 may be used in the case where the first PCE 320, the second PCE 322, or both may access private impairment information about a vendor's equipment but may not share it. Further, separating the IV process into an initial approximated IV and a subsequent detailed-IV between the first PCE 320 and the second PCE 322 may improve the efficiency and precision of IA-RWA.
  • a PCC 410 may send a path computation request to a first PCE (or IV entity) 420, which may be configured to perform IV using approximate or detailed techniques/models.
  • the first PCE 420 may have previous knowledge of shared impairment information for a plurality of vendors' equipment but may obtain additional impairment information, such as non-shared impairment information for any additional vendor's equipment.
  • the third PCE 424 may receive the path computation request from the PCC 410 and generate a list of computed paths and corresponding wavelengths, which may be sent to the second PCE 422.
  • the second PCE 422 may assign wavelengths to the paths and communicate the list of paths and wavelengths to the first PCE 420 to validate each path.
  • the first PCE 420 may send a positive or negative response for each computed path, e.g. without sharing private impairment information.
  • the validated paths and associated wavelengths may be sent to the PCC 410, via any of the PCEs.
  • FIG. 5 illustrates an embodiment of another separated IA-RWA architecture 500.
  • a PCC 510 may send a path computation request to a first PCE (or IV entity) 520, which may be configured to perform IV using approximate or detailed techniques/models and send a list of validated paths and corresponding wavelengths to a second PCE 522, e.g. in a manner similar to the separated IA-RWA architecture 400.
  • the second PCE 522 may be configured to perform combined RWA, e.g. using a shared processor or dedicated processors.
  • the PCReq Message information described herein is passed between RWA-Coord-PCE (PCE2 622) and the IV-PCE (PCEl 620) of the separated IA-RWA architecture 600.
  • the second PCE 622 may send a validation request for each computed path to the third PCE 624, and the third PCE 624 may return a positive or negative response to the second PCE 622, based on the outcome of a detailed IV process. As such, the second PCE 622 may not obtain any private impairment information in the response from the third PCE 624.
  • the second PCE 722 may receive the computed paths and RWA information from the first PCE 720 and may have previous knowledge of shared impairment information, e.g. for a plurality of vendors' equipment. The second PCE 722 may also request additional impairment information, such as non-shared impairment information for any additional vendor's equipment. Thus, the second PCE 722 may perform combined WA and IV using the RWA information and the impairment information. The second PCE 722 may use a single, or a plurality of, processors to perform the combined WA and IV. The second PCE 722 may perform approximated IV or detailed IV to validate the computed paths. Further, the second PCE 722 may perform IV before WA.
  • a PCE 810 may receive some or all of the RWA information from the NEs 820, 830, and 840, perhaps via direct link, and perform the routing assignment. The PCE 810 then directly or indirectly passes the routing assignment to the individual NEs 820, 830, and 840, which may then perform distributed WA and IV (WA/IV) at the local links between the NEs 820, 830, and 840, e.g. based on local information.
  • WA and IV WA and IV
  • the signals may be routed while the wavelengths are assigned and the lightpaths are validated in a distributed manner between the NEs until a destination node is reached. Assigning the wavelengths at the individual NEs may reduce the amount of RWA information and impairment information that may be forwarded between the NEs and between the NEs and the PCE 810. However, such distributed WA/IV schemes may require sharing some local and private impairment information between the NEs. Further, such signaling based schemes may become less practical as the quantity of computed paths and the available wavelengths increase. [0090] At least some of the IA-RWA architectures described above may require changes in current protocols and/or standards, for example regarding the PCE, signaling, the information model, routing, or combinations thereof. Table 1 illustrates some aspects of the system that may require changes to support the IA-RWA architectures above.
  • ITU-T G.680 may describe some impairment measures that may be used, such as computation formulas for OSNR, residual dispersion, polarization mode dispersion/polarization dependent loss, effects of channel uniformity, etc. However, ITU-T G.680 does not specify which measurements may be stored or maintained in the nodes and in what form.
  • the different IA-RWA architectures above may also use different path/wavelength impairment validation, which may impose different demands on routing. For instance, in the case where approximate impairment information is used to validate the paths, GMPLS routing may be used to distribute the impairment characteristics of the NEs and the links, e.g. based on an impairment information model.
  • GMPLS routing may be used to distribute the impairment characteristics of the NEs and the links, e.g. based on an impairment information model.
  • no changes to the routing protocol may be necessary, but substantial changes may be needed in the signaling protocol to enable IV.
  • the characteristics of the transported signal in the distributed scheme such as the signal modulation type, may affect system tolerance to optical impairments. Therefore, it may be advantageous to communicate such signal characteristics in the distributed scheme, e.g. via signaling.
  • PCE 522) may be configured to perform RWA computations and coordinate the overall IA-RWA process and the other PCE (e.g. PCE 520) may be configured to perform IV for candidate paths (IV-Candidate).
  • the RWA PCE may interact with a PCC to receive path computation requests and with the IV-Candidates PCE to perform IV as needed and obtain a valid set of paths and wavelengths.
  • the RWA PCE may also be configured to maintain, e.g. in a TED, information about network (e.g. WSON) topology and switching capabilities and about network WDM link wavelength utilization. However, the IV RWA PCE may not maintain impairment information.
  • the RWA PCE may send an IV request 1004 to the IV PCE, which may be an IV-Candidates PCE. As such, the RWA PCE may ask for K paths and acceptable wavelengths for the paths between the two nodes indicated in the PCC request.
  • the IV-Candidates PCE may perform IV, e.g. using approximate techniques/models, to obtain a list of validated paths and associated wavelengths.
  • the IV- Candidates PCE may then send a reply 1008, which comprises the list of paths and wavelengths, to the RWA PCE.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
EP10745833.3A 2009-02-27 2010-02-26 Pfadberechnungs-elementprotokollsoperation zur unterstützung wellenlängengeschalteter, optischer netzwerkleitweglenkung, wellenlängenzuweisung und wertminderungsvalidierung Active EP2245776B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US15628709P 2009-02-27 2009-02-27
US12/710,757 US8346079B2 (en) 2009-02-27 2010-02-23 Path computation element protocol (PCEP) operations to support wavelength switched optical network routing, wavelength assignment, and impairment validation
PCT/CN2010/070767 WO2010097049A1 (en) 2009-02-27 2010-02-26 Path computation element protocol (pcep) operations to support wavelength switched optical network routing, wavelength assignment, and impairment validation

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EP2245776A1 true EP2245776A1 (de) 2010-11-03
EP2245776A4 EP2245776A4 (de) 2011-08-31
EP2245776B1 EP2245776B1 (de) 2014-12-03

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US (3) US8346079B2 (de)
EP (1) EP2245776B1 (de)
CN (1) CN102783066B (de)
WO (1) WO2010097049A1 (de)

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AZODOLMOLKY S ET AL: "A survey on physical layer impairments aware routing and wavelength assignment algorithms in optical networks", COMPUTER NETWORKS, ELSEVIER SCIENCE PUBLISHERS B.V., AMSTERDAM, NL, vol. 53, no. 7, 13 May 2009 (2009-05-13), pages 926-944, XP026007938, ISSN: 1389-1286, DOI: DOI:10.1016/J.COMNET.2008.11.014 [retrieved on 2008-12-11] *
DANIEL KING ET AL: "Path Computation Architectures Overview in Multi-Domain Optical Networks Based on ITU-T ASON and IETF PCE", NETWORK OPERATIONS AND MANAGEMENT SYMPOSIUM WORKSHOPS, 2008. NOMS WORKSHOPS 2008. IEEE, IEEE, PISCATAWAY, NJ, USA, 7 April 2008 (2008-04-07), pages 219-226, XP031247452, ISBN: 978-1-4244-2067-4 *
FARREL (ED) OLD DOG CONSULTING GREG BERNSTEIN GROTTO NETWORKING A: "Conveying Vendor-Specific Constraints in the Path Computation Element Protocol; draft-farrel-pce-vendor-constraints-02.txt ", CONVEYING VENDOR-SPECIFIC CONSTRAINTS IN THE PATH COMPUTATION ELEMENT PROTOCOL; DRAFT-FARREL-PCE-VENDOR-CONSTRAINTS-02.TXT , INTERNET ENGINEERING TASK FORCE, IETF; STANDARDWORKINGDRAFT, INTERNET SOCIETY (ISOC) 4, RUE DES FALAISES CH- 1205 GENEVA, SWIT, no. 2, 2 November 2008 (2008-11-02), XP015057640, *
See also references of WO2010097049A1 *
VASSEUR J P ET AL: "Path Computation Element (PCE) communication protocol (PCEP) draft V0.9", 16 November 2007 (2007-11-16), INTERNET-DRAFT INFORMATIONAL DRAFT, XX, XX, PAGE(S) 1 - 72, XP002467628, * the whole document * *

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CN102783066B (zh) 2016-05-25
US8346079B2 (en) 2013-01-01
US20150063804A1 (en) 2015-03-05
EP2245776A4 (de) 2011-08-31
CN102783066A (zh) 2012-11-14
US9392348B2 (en) 2016-07-12
US20100220996A1 (en) 2010-09-02
EP2245776B1 (de) 2014-12-03
US8923695B2 (en) 2014-12-30
WO2010097049A1 (en) 2010-09-02

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